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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">Q3PtrStack Class Reference</h1>

<p>The Q3PtrStack class is a template class that provides a stack. <a href="#details">More...</a></p>

<pre>#include <Q3PtrStack></pre><p><b>This class is part of the Qt 3 support library.</b> It is provided to keep old source code working. We strongly advise against using it in new code. See the <a href="porting4.html">Porting Guide</a> for more information.</p>

<p>Part of the <a href="qt3support.html">Qt3Support</a> module.</p>

<p>Inherits <a href="q3ptrcollection.html">Q3PtrCollection</a>.</p>

<ul>

<li><a href="q3ptrstack-members.html">List of all members, including inherited members</a></li>

</ul>

<h3>Public Functions</h3>

<ul>

<li><div class="fn"/><b><a href="q3ptrstack.html#Q3PtrStack">Q3PtrStack</a></b> ()</li>

<li><div class="fn"/><b><a href="q3ptrstack.html#Q3PtrStack-2">Q3PtrStack</a></b> ( const Q3PtrStack<type> & <i>s</i> )</li>

<li><div class="fn"/><b><a href="q3ptrstack.html#dtor.Q3PtrStack">~Q3PtrStack</a></b> ()</li>

<li><div class="fn"/>bool <b><a href="q3ptrstack.html#autoDelete">autoDelete</a></b> () const</li>

<li><div class="fn"/>virtual void <b><a href="q3ptrstack.html#clear">clear</a></b> ()</li>

<li><div class="fn"/>virtual uint <b><a href="q3ptrstack.html#count">count</a></b> () const</li>

<li><div class="fn"/>type * <b><a href="q3ptrstack.html#current">current</a></b> () const</li>

<li><div class="fn"/>bool <b><a href="q3ptrstack.html#isEmpty">isEmpty</a></b> () const</li>

<li><div class="fn"/>void <b><a href="q3ptrstack.html#push">push</a></b> ( const type * <i>d</i> )</li>

<li><div class="fn"/>bool <b><a href="q3ptrstack.html#remove">remove</a></b> ()</li>

<li><div class="fn"/>void <b><a href="q3ptrstack.html#setAutoDelete">setAutoDelete</a></b> ( bool <i>enable</i> )</li>

<li><div class="fn"/>type * <b><a href="q3ptrstack.html#top">top</a></b> () const</li>

<li><div class="fn"/><b><a href="q3ptrstack.html#operator-type--2a">operator type *</a></b> () const</li>

<li><div class="fn"/>Q3PtrStack<type> & <b><a href="q3ptrstack.html#operator-eq">operator=</a></b> ( const Q3PtrStack<type> & <i>s</i> )</li>

</ul>

<ul>

<li><div class="fn"/>4 public functions inherited from <a href="q3ptrcollection.html#public-functions">Q3PtrCollection</a></li>

</ul>

<h3>Protected Functions</h3>

<ul>

<li><div class="fn"/>virtual QDataStream & <b><a href="q3ptrstack.html#read">read</a></b> ( QDataStream & <i>s</i>, Q3PtrCollection::Item & <i>item</i> )</li>

<li><div class="fn"/>virtual QDataStream & <b><a href="q3ptrstack.html#write">write</a></b> ( QDataStream & <i>s</i>, Q3PtrCollection::Item <i>item</i> ) const</li>

</ul>

<ul>

<li><div class="fn"/>2 protected functions inherited from <a href="q3ptrcollection.html#protected-functions">Q3PtrCollection</a></li>

</ul>

<hr />

<h2>Detailed Description</h2>

<p>The Q3PtrStack class is a template class that provides a stack.</p>

<p><a href="q3valuestack.html">Q3ValueStack</a> is an STL-compatible alternative to this class.</p>

<p>Define a template instance Q3PtrStack<X> to create a stack that operates on pointers to X, (X*).</p>

<p>A stack is a last in, first out (LIFO) structure. Items are added to the top of the stack with <a href="q3ptrstack.html#push">push</a>() and retrieved from the top with <a href="q3ptrstack.html#pop">pop</a>(). Use <a href="q3ptrstack.html#top">top</a>() to get a reference to the top element without changing the stack.</p>

<p>You can control the stack's deletion policy with <a href="q3ptrstack.html#setAutoDelete">setAutoDelete</a>().</p>

<p>For compatibility with the <a href="q3ptrcollection.html">Q3PtrCollection</a> classes <a href="q3ptrstack.html#current">current</a>() and <a href="q3ptrstack.html#remove">remove</a>() are provided; they both operate on the <a href="q3ptrstack.html#top">top</a>().</p>

<p>See also <a href="q3ptrlist.html">Q3PtrList</a> and <a href="q3ptrqueue.html">Q3PtrQueue</a>.</p>

<hr />

<h2>Member Function Documentation</h2>

<h3 class="fn"><a name="Q3PtrStack"></a>Q3PtrStack::Q3PtrStack ()</h3>

<p>Creates an empty stack.</p>

<h3 class="fn"><a name="Q3PtrStack-2"></a>Q3PtrStack::Q3PtrStack ( const Q3PtrStack<type> & <i>s</i> )</h3>

<p>Creates a stack by making a shallow copy of another stack <i>s</i>.</p>

<h3 class="fn"><a name="dtor.Q3PtrStack"></a>Q3PtrStack::~Q3PtrStack ()</h3>

<p>Destroys the stack. All items will be deleted if <a href="q3ptrstack.html#autoDelete">autoDelete</a>() is TRUE.</p>

<h3 class="fn"><a name="autoDelete"></a>bool Q3PtrStack::autoDelete () const</h3>

<p>The same as <a href="q3ptrcollection.html#autoDelete">Q3PtrCollection::autoDelete</a>().</p>

<p>See also <a href="q3ptrstack.html#setAutoDelete">setAutoDelete</a>().</p>

<h3 class="fn"><a name="clear"></a>void Q3PtrStack::clear ()  <tt> [virtual]</tt></h3>

<p>Removes all items from the stack, deleting them if <a href="q3ptrstack.html#autoDelete">autoDelete</a>() is TRUE.</p>

<p>Reimplemented from <a href="q3ptrcollection.html#clear">Q3PtrCollection</a>.</p>

<p>See also <a href="q3ptrstack.html#remove">remove</a>().</p>

<h3 class="fn"><a name="count"></a><a href="qtglobal.html#uint-typedef">uint</a> Q3PtrStack::count () const  <tt> [virtual]</tt></h3>

<p>Returns the number of items in the stack.</p>

<p>Reimplemented from <a href="q3ptrcollection.html#count">Q3PtrCollection</a>.</p>

<p>See also <a href="q3ptrstack.html#isEmpty">isEmpty</a>().</p>

<h3 class="fn"><a name="current"></a>type * Q3PtrStack::current () const</h3>

<p>Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty.</p>

<h3 class="fn"><a name="isEmpty"></a>bool Q3PtrStack::isEmpty () const</h3>

<p>Returns TRUE if the stack contains no elements; otherwise returns FALSE.</p>

<h3 class="fn"><a name="pop"></a>type * Q3PtrStack::pop ()</h3>

<p>Removes the top item from the stack and returns it. The stack must not be empty.</p>

<h3 class="fn"><a name="push"></a>void Q3PtrStack::push ( const type * <i>d</i> )</h3>

<p>Adds an element <i>d</i> to the top of the stack. Last in, first out.</p>

<h3 class="fn"><a name="read"></a><a href="qdatastream.html">QDataStream</a> & Q3PtrStack::read ( <a href="qdatastream.html">QDataStream</a> & <i>s</i>, <a href="q3ptrcollection.html#Item-typedef">Q3PtrCollection::Item</a> & <i>item</i> )  <tt> [virtual protected]</tt></h3>

<p>Reads a stack item, <i>item</i>, from the stream <i>s</i> and returns a reference to the stream.</p>

<p>The default implementation sets <i>item</i> to 0.</p>

<p>Reimplemented from <a href="q3glist.html#read-2">Q3GList</a>.</p>

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<p>See also <a href="q3ptrstack.html#write">write</a>().</p>

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<h3 class="fn"><a name="remove"></a>bool Q3PtrStack::remove ()</h3>

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<p>Removes the top item from the stack and deletes it if <a href="q3ptrstack.html#autoDelete">autoDelete</a>() is TRUE. Returns TRUE if there was an item to pop; otherwise returns FALSE.</p>

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<p>See also <a href="q3ptrstack.html#clear">clear</a>().</p>

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<h3 class="fn"><a name="setAutoDelete"></a>void Q3PtrStack::setAutoDelete ( bool <i>enable</i> )</h3>

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<p>Defines whether this stack auto-deletes its contents. The same as <a href="q3ptrcollection.html#setAutoDelete">Q3PtrCollection::setAutoDelete</a>().</p>

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<p>If <i>enable</i> is TRUE the stack auto-deletes its contents; if <i>enable</i> is FALSE the stack does not delete its contents.</p>

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<p>See also <a href="q3ptrstack.html#autoDelete">autoDelete</a>().</p>

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<h3 class="fn"><a name="top"></a>type * Q3PtrStack::top () const</h3>

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<p>Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty.</p>

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<h3 class="fn"><a name="write"></a><a href="qdatastream.html">QDataStream</a> & Q3PtrStack::write ( <a href="qdatastream.html">QDataStream</a> & <i>s</i>, <a href="q3ptrcollection.html#Item-typedef">Q3PtrCollection::Item</a> <i>item</i> ) const  <tt> [virtual protected]</tt></h3>

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<p>Writes a stack item, <i>item</i>, to the stream <i>s</i> and returns a reference to the stream.</p>

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<p>The default implementation does nothing.</p>

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<p>Reimplemented from <a href="q3glist.html#write-2">Q3GList</a>.</p>

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<h3 class="fn"><a name="operator-type--2a"></a>Q3PtrStack::operator type * () const</h3>

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<p>Returns a pointer to the top item on the stack (most recently pushed). The stack is not changed. Returns 0 if the stack is empty.</p>

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<h3 class="fn"><a name="operator-eq"></a>Q3PtrStack<type> & Q3PtrStack::operator= ( const Q3PtrStack<type> & <i>s</i> )</h3>

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<p>Sets the contents of this stack by making a shallow copy of another stack <i>s</i>. Elements currently in this stack will be deleted if <a href="q3ptrstack.html#autoDelete">autoDelete</a>() is TRUE.</p>

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